Heart monitoring device



FIG. 1 is a front perspective view from above and to one side of a heart monitoring device of our new design;

FIG. 2 is a rear perspective view thereof from below and to one side;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a side view thereof; and,

FIG. 6 is a front perspective view thereof from above and to one side showing the casing of the heart monitoring device in an open position. 

The ornamental design for a heart monitoring device, as shown and described. 